Henry crompton ashlin



(No Model.)

0. ASHLIN. STEAM BOILER FURNACE.

No. 480,864. Patented Aug. 16, 1892.

UNITED STATES PATENT OFFICE.

HENRY- CROMPTON ASHLIN, or LONDON, ENGLAND.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 480,864, dated August16, 1892.

Application filed November 18, 1891, Serial No. 412,283.

To all whom it may concern:

Be it known that I, HENRY CROMPTON AsH- EIN, a subject of the Queen ofEngland, residing at London, England, have invented certain new anduseful Improvements in Steam-Boiler Furnaces, (for which 'I haveobtained Letters Patent in Great Britain, No. @715}, dated May 1, 1890,)of which the followmg is a specification.

The object of this invention is to facilitate the application andremoval of the furnaces, more particularly in marine boilers, wheregreat difficulty is at present experienced when an old furnace has to beremoved and a new one inserted. Usually the furnace is so secured thatit is a most difficult matter to get it out; but by my invention thisbecomes quite a simple operation.

In carrying out my invention I prefer to flange the front tube-plateorfront plate of the boiler around the furnace-opening, but to leave theback tube-plate plain around the said opening. I provide the furnacewith a flange at its back or inner end to fit up against the back plate;but I leaveit plain at its front end, where it can be riveted to theflanged plate of the boiler. The lower portion of the back end of thefurnace I prefer to cut away at an angle to facilitate its removal. Bythis arrangement it is a comparatively simple matter to remove orreplace the furnace, as all that is necessary is to knock out the rivetsand draw the furnace forward until the flange at the upper portion ofits back end meets the flange of the front plate, when by canting thefurnace up the cut-away portion can be caused to clear the lower portionof the flanged furnace-opening in the front plate, and the furnace canthen be freely removed.

In the accompanying drawings, Figure 1 is a longitudinal section of thetube in position, and Fig. 2 is a similar view showing the tube incourse of removal.

A is the furnace-tube, which may be of- (No model.) Patented in EnglandMay 1, 1890, No. 6,718.

at O for a portion of the way round. The extent of the flange 0 woulddepend upon the shape of'the combustion-chamber and plates of the boileragainst which the tube has to fit; but it might be carried roundgenerally for about one-third (more or less) of the circumference of thetube. In the drawings the flange G is stopped oif somewhere about thepoint C, the exact position depending, as stated above, upon the shapeof the plates to which it has to be attached. The portion of the backend of the tube from D to E is tapered off, by which means, as shown inFig. 2, when the tube is withdrawn its lower portion clears the frontfurnace-plate F, so that the tube can be dropped and the flange Ccleared from the upper portion of the front plate.

The front plate F is flanged inwardly at F,

the back plate G not requiring to be flanged at all. The rivets at thefront end would be placed through the cylindrical portion 13 of the tubeand the flange F and at the back through the flange G and plate G at theupper portion and through the tapered portion of the tube D to E and theplate of the boiler at the other part. In Fig. l the furnace-tube isshown in position. In Fig. 2 it is in process of removal and has beendrawn out as far as the flange C will allow. To complete the removal, itmay be tilted, if necessary, until the corner E clears the plate F. Bythis means it will be seen that an existing furnace-tube may be removedand repaired or a new one replaced without otherwise disturbing theboiler.

I claim 1. A furnace-tube having no flange at one end and partly flangedand partly cut away at the opposite end in a direction toward the bodyof said tube, for the purpose specified.

2. A furnace-tube having no flange at one end and provided at itsopposite end with a flange 0, extending partially around thecircumference of the tube, and having the remainder of saidcircumference cut away obliquely in a direction toward the body of thetube, as at D E, for the purpose specified.

3. The combination,with the front plate F, hand in the presence of thetwo subscribing IO flanged, as at F, and the back plate G, havwitnesses.in" no flan e of the furnace-tube one end 1 ha ting no fl ange andfitting within the said HENRY CROMPl ON ASHLIN' 5 plate F and theopposite end of the tube be- Witnesses:

ing provided with a flange C, fitting against WILLIAM BROWN, 1st, theexterior of the plate G and being cut Nwholas Bmldmg, N. O. away, as atD E, for the purpose specified; EDMOND REARDON,

In testimony whereof I have hereto set my U. S. Consulate,Ne-wcastZe-on-Tyne.

